Make YouTube prettyPhoto Lightbox Larger From a Link

prettyPhoto plays YouTube clips in a standard size. But how to make it play a movie in larger size? In a link calling YouTube movie add size parameters http://youtu.be/movieAddress?width=853&height=480 at the end (it can be any other size). Larger sizes trigger higher quality.

You may also disable related movies from the link: ?&rel=0&width=853&height=480

The great enhancements I found on latest version of prettyPhoto is that when a lightbox closes YouTube clip is stopping. That was the most annoying bug in Internet Explorer in previous versions.